Alert archive / Missouri / Flash Flood Warnings in 2020
Flash Flood Warning 25, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jun 22, 2020, 5:18 PM CDT for Saint Charles County, Warren County, Missouri. It was in force for 4 hr. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 22, 2020, 5:18 PM CDT (22:18 UTC)
- Expired
- Jun 22, 2020, 9:15 PM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Saint Charles County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 25 km from the middle of the area, began a volume at 22:20 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 22, 5:30 PM CDT | FLASH FLOOD | 2 Ssw Lake Saint Louis, MO | A COUPLE OF INCHES OF WATER OVER WEST BOUND LANE OF HIGHWAY N ABOUT A MILE WEST OF INTERSECTION WITH I-64. |
| Jun 22, 6:00 PM CDT | HEAVY RAIN 3.4 | 2 W Lake Saint Louis, MO | RAINFALL IN THE PAST 4 HOURS. |
| Jun 22, 7:00 PM CDT | FLASH FLOOD | Flint Hill, MO | WATER ACROSS MEXICO ROAD ABOUT HALF A MILE SOUTH OF INTERSECTION WITH HIGHWAY P. DEPTH WAS UNKNOWN. WATER RECEDED BY 730 PM. |
| Jun 22, 7:15 PM CDT | HEAVY RAIN 3.32 | 1 Sw Flint Hill, MO | AN ADDITIONAL 1.09 INCHES IN THE PAST HALF HOUR, SO FAR 3.32 INCHES TODAY. |
| Jun 22, 7:45 PM CDT | HEAVY RAIN 4.63 | Flint Hill, MO | FOR THE DAY SO FAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 246 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 401 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1137 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
188
WGUS53 KLSX 222218
FFWLSX
MOC183-219-230215-
/O.NEW.KLSX.FF.W.0025.200622T2218Z-200623T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
518 PM CDT Mon Jun 22 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Northwestern St. Charles County in east central Missouri...
East central Warren County in east central Missouri...
* Until 915 PM CDT.
* At 518 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to three inches of rain have
already fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flooding include...
O'Fallon, Wentzville, Lake St. Louis, Dardenne Prairie, Wright
City, St. Paul, Innsbrook, New Melle, Josephville, Flint Hill and
Foristell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.
&&
LAT...LON 3886 9107 3887 9098 3887 9096 3888 9096
3889 9087 3887 9082 3888 9081 3890 9081
3891 9074 3865 9074 3866 9108
FLASH FLOOD...RADAR INDICATED
$$
Byrd1 follow-up statement
493
WGUS73 KLSX 230221
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
921 PM CDT Mon Jun 22 2020
MOC183-219-230231-
/O.EXP.KLSX.FF.W.0025.000000T0000Z-200623T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
St. Charles MO-Warren MO-
921 PM CDT Mon Jun 22 2020
...THE FLASH FLOOD WARNING FOR NORTHWESTERN ST. CHARLES AND EAST
CENTRAL WARREN COUNTIES HAS EXPIRED...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3886 9107 3887 9098 3887 9096 3888 9096
3889 9087 3887 9082 3888 9081 3890 9081
3891 9074 3865 9074 3866 9108
$$
ByrdThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 2:04 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 26 min |
| Jun 22, 6:51 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles, Warren | 39 min |
Nearby
Flash Flood Warnings in Missouri, 2020Every flash flood warning in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.